Thyristors | Silicon Controlled Rectifiers | RS
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    Thyristors

    Thyristors are four-layer semiconductor devices, also known as a silicon controlled rectifier (SCR) It is like a fast static switch and is good for controlling large amounts of power, they can also control the speed of DC motors. You can learn more in our complete guide to thyristors.

    How do thyristors work?

    Thyristors usually consist of three electrodes: an anode (positive terminal), Cathode (negative terminal) and a gate. (You can also get thyristors with two or four leads). The gate is the main control terminal while the main current flows between the anode and cathode Thyristors are made of N-type and P-type materials. The N-type material is formed by doping an element with electrons to increase the number of negative charge-carrying electrons. The P-type material is also produced through doping, although the resulting charge-carrying electrons are positively charged. By alternating layers of P and N-type material, a semiconductor thyristor device is formed. Thyristors are used to create a latching circuit. Thyristors can be turned on using the gate. It then turns off when the voltage across the anode-cathode drops back down to zero.

    Types of thyristors

    • Silicon controlled rectifier (SCR) - The basic purpose of an SCR is to function as a switch that can turn on or off small or large amounts of power.
    • Silicon controlled switch (SCS) - Silicon Controlled Switch (SCS) is a device similar to an SCR, but it is designed to turn off when a positive voltage/input current pulse is applied to an additional "Anode gate".
    • Triac - Triac gets its name from Triode for alternating current Triacs are similar to SCRs but it conducts in both directions, (a bidirectional device). This means that it can switch AC and DC currents., Firing circuit commander modules are required for this.
    • Four-layer diode - A four-layer diode has 2 pins and is similar to a voltage-sensitive switch. When the voltage between the two pins exceeds the breakdown voltage it turns ON, otherwise its OFF.
    • Diac - Diac is a mix of the words diode and ac switch it is similar to a four-layer diode but it can conduct in both directions meaning it can contact both AC and DC currents.

    Applications of thyristors

    Thyristors are commonly found in many everyday applications such as:

    • Motor speed controls
    • Pressure control systems
    • Light dimmers
    • Liquid level regulators

    1069 Products showing for Thyristors

    United Automation
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    Screw Mount
    -
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    -
    -
    -
    92 x 62 x 44mm
    Infineon
    280A
    Diode
    -
    1800V
    -
    -
    -
    -
    150mA
    -
    -
    2V
    -
    150mA
    7
    -
    STMicroelectronics
    8A
    SCR
    TO-220AB
    600V
    -
    145A
    Through Hole
    -
    200µA
    -
    -
    0.8V
    -
    5mA
    3
    10.4 x 4.6 x 15.75mm
    Vishay
    6.5A
    SCR
    D2PAK (TO-263)
    800V
    -
    140A
    Surface Mount
    -
    15mA
    -
    -
    1V
    -
    30mA
    3
    10.67 x 9.65 x 4.83mm
    Vishay
    10A
    SCR
    TO-220AC
    800V
    -
    200A
    Through Hole
    -
    60mA
    -
    -
    2V
    -
    100mA
    3
    10.54 x 4.57 x 8.76mm
    Littelfuse
    40A
    SCR
    TO-220AB
    400V
    -
    520A
    Through Hole
    -
    40000µA
    -
    -
    1.5V
    -
    60mA
    3
    10.67 x 4.78 x 15.75mm
    Infineon
    330A
    SCR
    BG-PB50AT-1
    1600V
    520A
    10000A
    -
    -
    200mA
    -
    -
    -
    -
    -
    -
    -
    Infineon
    820A
    -
    BG-PB60AT-1
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    IXYS
    130A
    SCR Module
    Y4 M6
    1200V
    -
    5.08kA
    Panel Mount
    -
    150mA
    -
    -
    2.5V
    -
    200mA
    7
    94 x 34 x 30mm
    STMicroelectronics
    25A
    SCR
    D2PAK
    600V
    -
    394A
    Surface Mount
    -
    15mA
    -
    -
    1.3V
    -
    60mA
    2 + Tab
    10.28 x 9.35 x 4.6mm
    Infineon
    240A
    Diode
    -
    1600V
    -
    -
    -
    -
    145mA
    -
    -
    2.5V
    -
    200mA
    7
    -
    Semikron
    119A
    SCR
    SEMIPACK1
    1600V
    -
    2250A
    Panel Mount
    -
    100mA
    -
    -
    2.5V
    -
    250mA
    5
    93 x 20 x 30mm
    IXYS
    48A
    SCR
    TO-247AD
    1600V
    -
    560A
    Through Hole
    -
    100mA
    -
    -
    1.5V
    -
    100mA
    3
    -
    Infineon
    280A
    Diode
    -
    1800V
    -
    -
    -
    -
    150mA
    -
    -
    2V
    -
    150mA
    7
    -
    STMicroelectronics
    -
    SCR
    D²PAK
    1200V
    40A
    400A
    -
    -
    50mA
    -
    -
    -
    -
    -
    -
    -
    IXYS
    50A
    SCR
    SOT-227B
    1200V
    -
    865A
    Surface Mount
    -
    200mA
    -
    -
    1.6V
    -
    100mA
    4
    38.23 x 25.25 x 12.22mm
    IXYS
    158A
    -
    SOT-227B
    1600V
    -
    2.16kA
    Screw Mount
    -
    200mA
    -
    -
    1.6V
    -
    200mA
    4
    38.23 x 25.25 x 12.22mm
    Vishay
    80A
    SCR
    TO-65
    1000V
    -
    1490A
    Thread Mount
    -
    250mA
    -
    -
    3.5V
    -
    200mA
    2
    19.2 x 17.35 x 42.5mm
    Semikron
    18A
    SCR
    B 2
    1600V
    -
    370A
    Thread Mount
    -
    100mA
    -
    -
    3V
    -
    150mA
    3
    14 (Dia.) x 41mm
    STMicroelectronics
    12A
    SCR
    DPAK
    -
    -
    115A
    Surface Mount
    -
    200µA
    -
    -
    -
    -
    5mA
    3
    6.73 x 6.22 x 2.17mm
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